Karnataka Chief Minister H D Kumaraswamy's teenaged son has lodged a complaint with the police, alleging that the staff of a Bangalore hotel assaulted him in the early hours of Thursday, a senior police official said.

Nikhil, a college student, said the staff of Empire Hotel beat him up following an argument after the hotel staff refused to serve him and two others food, Joint Commissioner of Police Bipin Gopalkrishna said.

The hotel has also lodged a complaint stating that three unidentified persons caused trouble in the hotel after the staff refused to serve them food after closing hours.

Nikhil has also alleged that his car was damaged.

"Both the complaints are being investigated," Gopalkrishna said.

Bowring and Lady Curzon Hospital Medical Superintendent Rajiv Shetty said three persons, including one identified as Nikhil, took treatment as outpatients in the hospital but he was not sure if it was the chief minister's son.